Remove listeners added before a job is scheduled for start (synchronously)

After a heap dump analysis it seems that not removing them is the cause of a memory leak
 * Run the same job again and again
 * Dump the heap, inspect Launch instance; the past executions listener should be referenced (strongly)
Merge branch 'oombug'

Conflicts:
	parallelj-archetype-web/pom.xml
	parallelj-archetype/pom.xml
	parallelj-core/pom.xml
	parallelj-extensions/pom.xml
	parallelj-jmx/pom.xml
	parallelj-launching/pom.xml
	parallelj-ssh/pom.xml
	parallelj-tools/pom.xml
	parallelj-tracknrestart/pom.xml
	pom.xml
Resolution: use master ones